How many unique?
But what if we want to calculate the number of unique site visitors? Sounds like a combination of selecting unique and then counting...
Yes, that's the point! To calculate the number of unique observations over a certain column use COUNT(DISTINCT( ... )) statement. For example,
12SELECT COUNT(DISTINCT(user_id)) FROM visitors
This query will return a single value - the number of unique user_id in the visitors table.
Swipe to start coding
Count the number of different cars models in the audi_cars table.
Oplossing
Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande optiesBedankt voor je feedback!
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Completion rate improved to 2.63How many unique?
But what if we want to calculate the number of unique site visitors? Sounds like a combination of selecting unique and then counting...
Yes, that's the point! To calculate the number of unique observations over a certain column use COUNT(DISTINCT( ... )) statement. For example,
12SELECT COUNT(DISTINCT(user_id)) FROM visitors
This query will return a single value - the number of unique user_id in the visitors table.
Swipe to start coding
Count the number of different cars models in the audi_cars table.
Oplossing
Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande optiesBedankt voor je feedback!
single
Awesome!
Completion rate improved to 2.63How many unique?
Veeg om het menu te tonen
But what if we want to calculate the number of unique site visitors? Sounds like a combination of selecting unique and then counting...
Yes, that's the point! To calculate the number of unique observations over a certain column use COUNT(DISTINCT( ... )) statement. For example,
12SELECT COUNT(DISTINCT(user_id)) FROM visitors
This query will return a single value - the number of unique user_id in the visitors table.
Swipe to start coding
Count the number of different cars models in the audi_cars table.
Oplossing
Schakel over naar desktop voor praktijkervaringGa verder vanaf waar je bent met een van de onderstaande optiesBedankt voor je feedback!
